<template>
    <div class="main">
       <!-- 面包屑导航区域 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>添加商品</el-breadcrumb-item>
    </el-breadcrumb> 
    <!-- 卡片视图 -->
    <el-card>
        <!-- 提示区域 -->
        <el-alert
        title="添加商品信息"
        type="info"
        center
        show-icon
        :closable="false">
        </el-alert>
        <!-- 步骤条区域 -->
        <!-- 字符串转化为数字-0 -->
        <el-steps :space="200" :active="activeIndex - 0" finish-status="success" align-center>
            <el-step title="基本信息"></el-step>
            <el-step title="商品参数"></el-step>
            <el-step title="商品属性"></el-step>
            <el-step title="商品图片"></el-step>
            <el-step title="商品内容"></el-step>
            <el-step title="完成"></el-step>
        </el-steps>
        <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px" label-position="top">
        <!-- tab栏区域 -->
         <el-tabs v-model="activeIndex" :tab-position="'left'" :before-leave="beforeTabLeave" @tab-click="tabClicked">
            <el-tab-pane label="基本信息" name="0">
                <el-form-item label="商品名称" prop="goods_name">
                    <el-input v-model="addForm.goods_name"></el-input>
                </el-form-item>
                <el-form-item label="商品价格" prop="goods_price" type="number">
                    <el-input v-model="addForm.goods_price"></el-input>
                </el-form-item>
                <el-form-item label="商品重量" prop="goods_weight">
                    <el-input v-model="addForm.goods_weight"></el-input>
                </el-form-item>
                <el-form-item label="商品数量" prop="goods_number" type="number">
                    <el-input v-model="addForm.goods_number"></el-input>
                </el-form-item>
                <el-form-item label="商品分类" prop="goods_cat">
                    <el-cascader
                    v-model="addForm.goods_cat"
                    :options="catelist"
                    :props="cateProps"
                    @change="handleChange">
                    </el-cascader>
                </el-form-item>
            </el-tab-pane>
            <el-tab-pane label="商品参数" name="1">
                <!-- 渲染表单的item项 -->
                <el-form-item :label="item.attr_name" v-for="item in manyTableData" :key="item.attr_id">
                    <!-- 复选框组-->
                    <el-checkbox-group v-model="item.attr_vals">
                        <el-checkbox :label="cb" v-for="(cb,i) in item.attr_vals" :key="i" border>
                        </el-checkbox>
                    </el-checkbox-group>
                </el-form-item>
            </el-tab-pane>
            <el-tab-pane label="商品属性" name="2">
                <el-form-item :label="item.attr_name" v-for="item in onlyTableData"
                :key="item.attr_id">
                <el-input v-model="item.attr_vals"></el-input>
                </el-form-item>
            </el-tab-pane>
            <el-tab-pane label="商品图片" name="3">
                <!-- action表示图片要上传的api地址 -->
                <el-upload
                class="upload-demo"
                :action="uploadURL"
                :on-preview="handlePreview"
                :on-remove="handleRemove"
                list-type="picture"
                :headers="headerObj"
                :on-success="handleSuccess">
                <el-button size="small" type="primary">点击上传</el-button>
                </el-upload>
            </el-tab-pane>
            <el-tab-pane label="商品内容" name="4">
                <!-- 富文本编辑器组件 -->
                <quill-editor v-model="addForm.goods_introduce"></quill-editor>
                <!-- 添加商品的按钮 -->
                <el-button  type="primary" class="btnAdd" @click="add">添加商品</el-button>
            </el-tab-pane>
            </el-tabs>
        </el-form>
    </el-card>
    <!-- 图片预览 -->
    <el-dialog
  title="图片预览"
  :visible.sync="previewVisible"
  width="50%">
  <img :src="previewPath" alt="" class="previewImg">
</el-dialog>
    </div>
</template>
<script>
import _ from 'lodash'
export default {
    data() {
        return {
            activeIndex: '0',
            // 添加商品的表单数据对象
            addForm: {
                goods_name: '',
                goods_price: '',
                goods_weight: '',
                goods_number: '',
                // 商品所属的分类数组
                goods_cat: [],
                // 图片的数组
                pics: [],
                // 商品的详情描述
                goods_introduce: '',
                attrs: []
            },
            addFormRules: {
                goods_name: [
                    { required: true, message: '请输入商品名称', trigger: 'blur' },
                ],
                goods_price: [
                    {required: true, message: '请输入商品价格', trigger: 'blur' },
                ],
                goods_weight: [
                    {required: true, message: '请输入商品重量', trigger: 'blur' },
                ],
                goods_number: [
                    {required: true, message: '请输入商品数量', trigger: 'blur' },
                ],
                goods_cat: [
                    {required: true, message: '请输入商品分类', trigger: 'blur' }
                ]
            },
            // 商品分类列表
            catelist: [],
            cateProps: {
                expandTrigger: 'hover',
                label: 'cat_name',
                value: 'cat_id',
                children: 'children',
                checkStrictly: true
            },
            // 动态参数列表数组
            manyTableData: [],
            // 静态属性列表数组
            onlyTableData: [],
            // 上传图片的URL地址
            uploadURL: 'https://www.liulongbin.top:8888/api/private/v1/upload',
            // 图片上传组件的headers请求头对象
            headerObj: {
                Authorization: window.sessionStorage.getItem('token')
            },
            previewPath: '',
            // 图片预览对话框默认隐藏
            previewVisible: false
        }
    },
    created() {
        this.getCateList()
    },
    methods: {
        // 获取所有商品分类数据
        async getCateList() {
           const {data: res} = await this.$http.get('categories')
           if(res.meta.status !== 200) {
               return this.$message.error('获取商品分类数据失败！')
           }
           this.catelist = res.data
           console.log(this.catelist)
        },
        // 级联选择器选中项变化触发的函数
        handleChange() {
            console.log(this.addForm.goods_cat)
            if(this.addForm.goods_cat.length!==3){
                this.addForm.goods_cat = []
            }
        },
        beforeTabLeave(activeName,oldActiveName) {
            // console.log('即将离开的标签页名字是：' + oldActiveName)
            // console.log('即将进入的标签页名字是：' + activeName)
            // return false
            if(oldActiveName === '0' && this.addForm.goods_cat.length !== 3)
            {
                this.$message.error('请先选择商品分类！')
                return false
            }
        },
        async tabClicked() {
            // console.log(this.activeIndex)
            if(this.activeIndex === '1') {
                const {data: res} = await this.$http.get(`categories/${this.cateId}/attributes`,
                {params: {sel: 'many'}
                }
                )
                if(res.meta.status !== 200) {
                    return this.$message.error('获取动态参数列表失败！')
                }
                console.log(res.data)
                res.data.forEach(item=> {
                    item.attr_vals =
                    item.attr_vals.length === 0 ?
                    [] : item.attr_vals.split(' ')
                })
                this.manyTableData = res.data
            } else if(this.activeIndex === '2') {
                const {data: res} = await this.$http.get(`categories/${this.cateId}/attributes`,
                {params: {sel: 'only'}
                })
                if(res.meta.status !== 200) {
                    return this.$message.error('获取静态参数失败！')
                }
                console.log(res.data)
                this.onlyTableData = res.data
            }
        },
        // 处理图片预览效果
        handlePreview(file) {
            console.log(file)
            this.previewPath = file.response.data.url
            this.previewVisible = true
        },
        // 处理移除图片的操作
        handleRemove(file) {
            // console.log(file)
            // 1.获取将要删除的图片的临时路径
            const filePath = file.response.data.tmp_path
            // 2.从pics数组中，找到这个图片对应的索引值
            const i = this.addForm.pics.findIndex(x =>{
                x.pic === filePath
            })
            // 3.调用数组的splice方法，把图片信息对象，从pics数组中移除
            this.addForm.pics.splice(i,1)
            console.log(this.addForm)
        },
        // 监听图片上传成功的事件
        handleSuccess(response) {
            console.log(response)
            // 1.拼接得到一个图片信息对象
            const picInfo = {
                pic: response.data.tmp_path
            }
            // 2.将图片信息对象，push到pics数组中
            this.addForm.pics.push(picInfo)
            console.log(this.addForm)
        },
        add() {
          this.$refs.addFormRef.validate(async valid => {
              if(!valid) {
                  return this.$message.error('请填写必要的表单项目！')
              }
            //  执行添加的业务逻辑
            // 深拷贝
            const form = _.cloneDeep(this.addForm)
            form.goods_cat = form.goods_cat.join(',') 
            // 处理动态参数
            this.manyTableData.forEach(item => {
                const newInfo = {
                    attr_id: item.attr_id,
                    attr_value: item.attr_vals.join(' ')
                    }
                    this.addForm.attrs.push(newInfo)
            })
            // 处理静态属性
            this.onlyTableData.forEach(item => {
                const newInfo = {
                    attr_id: item.attr_id,
                    attr_value: item.attr_vals
                }
                this.addForm.attrs.push(newInfo)
            })
            form.attrs = this.addForm.attrs
            console.log(form)
            //发起请求添加商品
            //商品的名称，必须是唯一的
            const {data: res} = await this.$http.post('goods',form)
            if(res.meta.status !== 201) {
                this.$message.error('添加商品失败！')
                console.log(res)
            }
            this.$message.success('添加商品成功！')
            this.$router.push('/goods')
          })
        }
    },
    computed: {
      cateId() {
          if(this.addForm.goods_cat.length === 3) {
              return this.addForm.goods_cat[2]
          }
          return null
      } 
    }
}
</script>
<style lang="less" scoped>
.main {
  display: block;
}
.el-checkbox {
    margin: 0 5px 0 0 !important;
}
.previewImg {
    width: 100%;
}
.btnAdd {
    margin-top: 15px;
}
</style>
